Yii2-Bootstrap：类yii \ bootstrap \ NavBar的对象无法转换为字符串Error

Question

我即将在yii2中集成twitter bootstrap主题。我添加了css＆amp; bootstrapThemeAsset＆amp;中的js文件bootstrapPluginAsset。尝试将导航栏转换为bootstrap导航栏，如下所示。

    <?= NavBar::begin(['class' => 'navbar-default navbar-static-side'])?>
    <!--<nav class="navbar-default navbar-static-side" role="navigation">-->

th抛出异常

PHP Recoverable Error – yii\base\ErrorException
Object of class yii\bootstrap\NavBar could not be converted to string

无法得到这个......

Answer 1

NavBar :: begin start widget，不返回字符串

使用

 <?php NavBar::begin(['class' => 'navbar-default navbar-static-side'])?>

P.S＆GT;

 <?= NavBar::begin(['class' => 'navbar-default navbar-static-side'])?>

与

相同

 <?php echo NavBar::begin(['class' => 'navbar-default navbar-static-side'])?>